Shim



P. E. FRITZ.

' SHIM.

APPLICATION F|LE D MAR. 24, 1921;

1,391,886. PatentedSept. 27,1921;

13 3140mmp Per/3551'. f k @W To all whom it may concern: l x

UNITED HAT PATENT li E? i PERRY n rnrrz, or LOS ANGELES, o-ALiFoRNrA. I

SHIM.

Be it known that I, PERRY, E. .Fnrrz, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and Sta e of California, have inventedv newand useful Improvements in Shims, ofwhich the following is-a specification. p

This invention relates to. shims and particularly pertains to a shim to be employed between upper and lower-halves of connecting rod boxes in internal combustion engines, compressors andthe like.

An object of my invention is to provlde a 'shim'of the above type; adapted to con= form to irregularities-in the opposed faces of halves of connecting rod boxes to completely fill all spacesftherebetween ,to facilitate retention of lubricating oil as well as to insureaccurate fitting-of the. boxes upon a crank pin.

Another object of the invention is to pro; vide a shim in which that edge which is adjacent the crank pin; and parallel thereto, bears directly upon the crank pin and pre sents a smooth frictionless bearing surface of bearing metal.

A further object, of the invention is to provide a construction in shims, with the above objects in View, whereby soft bearing metal may be employed to form a shim'of the requisite characteristics and adapted to resist excessive compression so that it will not be squeezed from between abutting surfaces.

companying drawings, in which Figure 1 is a view in perspective of a'shim constructed in accordance with the invention. I

Fig. 2 is a view in section as seen on the line 2-2 Fig. 1, looking in the direction of the arrows.

Fig. 3 is a view in vertical section of a connecting box and crank pin showing the shim applied thereto.

Fig. 4 is a view in vertical section of an inserted part of the shim.

More specifically, in carrylng out my 1nvention I employ a blank 4:, of soft metal or babbitt such as is employed on bearing surfaces. stamping from thin stock or by casting, and preferably by the latter method. The blank is shaped to conform to the general outllne The invention is illustrated by the ac- The blank may be formed by Specification of Letters I atent. Pate ted Se t, 27,1921, Application mew March 4,,T1s2r. Serial ire-455,112. i i

of the faces of the halves of the connecting rodibox or other surfaces to which it isto be applied'.andislhere shown as ofthe coma montriangular' form with rounded corners hole 6 is provided, anda plurality of other fndofsu'flicient thicknessto provide a bearholes, T offl'smaller diameter are also 'provided, preferably two in number with-one disposed at each side of the larger hole,

spaced a short distance therefrom and disposed belowthe center line of the larger hole. The smaller. holes are providedfor thelpurpose of receiving stops 8, of suitable form andmaterial but here shown as being cylindrical in form, and which are oft-a harder. material; than the blank, such as :brassgorbronzen The stops are pressed into theiholes 7, and to insure of theirholding .secur elyrtherein they are provided with an annular groove 9. The upper and lower ends of these stops are rounded]slightly to facilitate insertion in the holes and to remove burs. The annular grooves provide sharp edges 10, tending to hold the stops in the blank, and the grooves also permit of p the soft metal of the blank expanding there in whenthe shim is subject to pressure. The stops are of such length relative to the thickness of the blank that both the upper and lower ends are disposed below the sur face of the blank so that the shim may be A compressed slightly before the surfaces are brought flush withthe stops.

These stops definitely predetermine the degree to which the shim may be compressed and permit of the shim being subject to high compression without possibility of being compressed beyond the limit set by the stops,

Two of the shims described are shown in Fig. 3 in position between the upper and lower halves l1 and 12 respectively of a connecting rod box 13 which is shown as encompassing a crank pin 14 in the manner common to reciprocating engines and the like. These halves are held together by bolts 15, which pass through the hole 6, of the shim. Each half of the box is lined with hearing metal 16 to provide a bearing surface16, for the crank pin. The hole 6, is so positioned. relative to the'face 5, of the shim that when the shim is in place the faceprotrudes beyond the bearing surface of the boxes. lVhen a new pair of shims are being fitted to a connecting rod, the protruding ends of the shims are faced off by a reamer of the diameter of the crank pin so that the face of each shim is made slightly concave to conform to the curvature of the bearing the ductile qualities of the shims, vibration and contraction and expansion of the con-' necting rod box will not materially affect theshims. I

While I have shown and describedaspecific embodiment of my invention I am not limited to the exact details ofconstruction shown and described but may employ other constructions without departing from the spirit of the invention, coming within the scope of the appended claims, and while I have shown and described an application of the invention to shims for connecting-rods the invention may be applied to shims for various purposes as well as to'thrust-washers, gaskets, thrust-bearings and the like,

teriorly with bearing metal; shims formed where soft .metal is required or is advan- 86 mined degree.

2. A shim comprising a blank and stops embedded in said-blank, said stops formed of harder material than said blank, whereby the blank ,is prevented from being compressed beyond a predetermined degree.

I 3. A shim comprising a soft metal blank and a plurality of metal stops extending ver tically through said blank and having their upper and lower surfaces disposed below the corresponding surfaces of the blank;

4. A shim comprising a blank: of soft metal, and a plurality of stops extending vertically through the blank, said stops formed of harder metal than said blank and provided with annular, grooves.

5. In combination with a connecting rod box comprising two half sections lined in- V of bearing metal disposed between said half sections to form jointly with said bearing metal a continuous annular bearing surface and stops in said shims of metal harder than the metal of the shims to prevent compres sion thereof beyond a predetermined degree.

PERRY E. FRITZ. 

